1. Let’s try our best to ________ paper to save the trees.

A. throw away            B. make           C. recycle         D. waste

2. If you write something and it isn’t very good, you should _______ it.

A. repeat       B. recite        C. redo         D. rewrite

3. We tried to stop the flames from spreading, but we knew it was ____.

A. unusual     B. enjoyable    C. hopeful         D. hopeless

4. ---I think we should save the endangered animals.

  ---I agree ______ you. There aren’t many of them.

A. so    B. with      C. that      D. about

5. Don’t forget to turn ______ the lights when you leave the office.

A. on      B. off     C. up        D. in

6. Do turn off TV after watching _______ that you can use _______ energy.

A. so, less     B. so, more      C. because, little      D. because, much

7. These are plastic bags. Don’t ____.

A. throw away it                      B. throw it away

C. throw away them                  D. throw them away

8. Drinking too much ____ your health.

A. do harm to                     B. is harm to     

C. does harm to                        D. do harmful to

9. It’s our duty ______the environment.

A. protect       B. to protect       C. protecting       D. of protecting

10. Thousands of trees should ________ on the mountain.

   A. be planted   B. plant         C. planting       D. planted

11. To make our country more beautiful, rubbish_______ into the river.

A. needn’t be thrown     B. mustn’t be thrown   

  C. can’t throw   D. may not throw

12. There are usually _________ people in the supermarket every weekend.

A. too much    B. much too           C. many too       D. too many

13. We should _______ students from ________ computer games.

   A. stop, play     B. stopped, playing    C. stop, playing   D. stop, to play

14. I can’t believe my own eyes. The magician changes paper ________ money.

   A. on      B. from      C. out      D. into

15. My parents go to work by bike ____ by bus.